Sunsbell® Wireless Mini Portable 1.61 x 1.89 Inch Dot Matrix Sonar Fish Finder 230FT Probe Water Temperature Measurement Waterproof 90 Degree Angle Fishfinder

Sonar Technology
Sonar is a technology based on sound propagation to locate and define structure, bottom contour and composition by using the transducer. To determinate the distance of an object, the time interval between transmission of a sound wave signal by the transducer and reception of the object is measured. Then the fish finder uses the received signal to interpret the location, size and composition of the detected object.

Features:
Wireless sensor and can be mounted on fishing rod.
Large Adjustable Dot Matrix LCD Screen with white LED backlight
Determines the location and depth of fish
Can be used as a fish finder and a depth sounder
Can be used in both fresh and salt water
Wide Wireless Operation Range: 70 Meters (230 Feet)
Built-in Water Temperature Sensor in wireless sonar sensor
Display Water Temperature in °C or °F
Display Fish Icon and Live-Update Water Bottom Contour (grass, sand and rock) in the sea
IPx4 Water Resistant Design in Main Unit
Wireless Sensor would be automatically turned off when the sensor is out of water
Wireless Sensor with 90 degree beam angle
Long battery life for the wireless sensor (up to 550 hours)
Wireless Sensor Coverage: 90 degrees beam angle
Depth Range: 0.6 ~ 40 Meters (2 ~ 120 Feet)
Wireless Operation Range: 70 Meters (230 Feet)
Power (main unit): 4 x AAA alkaline batteries (not included)
Power (wireless sensor): 1 x 3V CR2032 Button Cell Battery (included)
Item size: approx: 5.35 x 2.91 x 1.18 inch
Package:
1 x Professional Dot Matrix Wireless Fish Finder